Partway through his Thursday “A Closer Look” segment, Late Night’s Seth Meyers apologized for the amount of swearing heading viewers’ way. And, sure, some of that was on Meyers’ Mets, but mostly, his exasperated (if NBC-bleeped) profanity was used to punctuate his monologue’s deftly infuriated response to yet another growing trend among the right-wing and conspiracy-minded. That new fad sweeping the nation being the recklessly ineffective ingestion of a popular horse and cow deworming medication because the professional misinformers and assorted white supremacists at Fox News tell them to. “Fuck,” indeed.